Decoders may at first appear to be quite difficult to understand but they are really quite simple. You need only remember:
A) decoding is totally random and completely accurate so the technician need not be concerned with how decoding is accomplished.
B) the inputs are always octal codes, therefore the output replicates the input.
C) decoding is simply a procedure where each output line will be activated for only one of the possible combinations of inputs.
D) decoding is a complex operation that does not follow a set pattern. Consequently, the manufacturer's data sheet must be consulted for each possible input code group.
C
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Per capita consumption of beef annually in the United States is about:
a. 50 pounds c. 80 pounds b. 65 pounds d. 95 pounds
Why are chillers often used to cool large buildings?
a. Chillers use less refrigerant than other units. b. Refrigerant piping is small because of low pressures. c. Refrigerant piping is small because of high pressure. d. Water piping is less expensive to install.
If reservoir-type humidifiers are not properly maintained, which of the following can be discharged into the air?
A. fungi B. bacteria C. algae D. all of the above
If the viscosity of a gas increases, its ability to flow __________.
A. increases B. decreases